Belt squeal (?) on cold start up on 2024 Chevy 2500HD 6.6L Gasser

[Tracker48]

I've got the same noise. I would have bet a weeks pay it was the belt. But after reading this thread I have my doubts. Quits by the time I back to the end of the driveway.

[MikeDJohnson]

My brand new 2024 3500hd SLE has the same problem since I bought it. Squeals on startup and  acceleration. Dealer says they don't want to explore the problem, but rather wait for a recall. Horseshit.

Edited September 11, 2024 by MikeDJohnson

[GMCustomerService]

On 9/10/2024 at 10:12 PM, MikeDJohnson said:

My brand new 2024 3500hd SLE has the same problem since I bought it. Squeals on startup and  acceleration. Dealer says they don't want to explore the problem, but rather wait for a recall. Horseshit.

We regret to hear of this concern with your vehicle and would like to take the time to investigate further on our end. Please send us an email to [email protected]. Be sure to include your Username and Forum name in the subject line with additional details. We look forward to hearing from you. 

[Tracker48]

6 hours ago, GMCustomerService said:

We regret to hear of this concern with your vehicle and would like to take the time to investigate further on our end. Please send us an email to [email protected]. Be sure to include your Username and Forum name in the subject line with additional details. We look forward to hearing from you. 

What about the rest of us with the same problem?

 

[Pryme]

My truck has a short squeals for 5-6 seconds upon start up and basically stops when I put it in drive to leave my garage. Its done it since new and hasn’t  changed duration so I don’t care. 

[MudMonkey]

Took the truck in again to the dealer.  They are still at a loss of what it is.

 

Dealership is going to order an intake and see what that does.  They basically told me they will bust out the parts cannon and keep throwing parts at it until GM stops paying for warranty work.

[GMCustomerService]

On 9/21/2024 at 2:53 PM, MudMonkey said:

Took the truck in again to the dealer.  They are still at a loss of what it is.

 

Dealership is going to order an intake and see what that does.  They basically told me they will bust out the parts cannon and keep throwing parts at it until GM stops paying for warranty work.

We are sorry to hear that you are still facing ongoing concerns with your vehicle and would like to take the time to investigate further. To get started, please send us an email to [email protected]. Be sure to include your Username and Forum name in the subject line with additional details. 

[mrjulian416]

On 9/21/2024 at 2:53 PM, MudMonkey said:

Took the truck in again to the dealer.  They are still at a loss of what it is.

 

Dealership is going to order an intake and see what that does.  They basically told me they will bust out the parts cannon and keep throwing parts at it until GM stops paying for warranty work.

Mud Monkey

Any news on the parts cannon solution?

[MudMonkey]

Per usual Gm, one of the parts is on back order.  I did hear a whistle noise while climbing on a mountain pass today.  The rpm’s were around 2500 when I could hear it.  Almost sounded like a faint turbo whistle.

 

i thought I seen a post about something similar.  I can’t remember if it was on a gasser or diesel.

 

Maybe the two sounds are related.

[Big Timber]

I also have been dealing with this noise, exactly as described in this post. 2024 2500HD gas. Mostly on start-up, louder when put into R or D and on light acceleration when driving or in a drive-thru, etc.

 

Had two different dealers look at it. First dealer couldn't replicate it and when I picked it up and pointed out the noise they said they don't hear an issue. Second dealer it did it very loud when I dropped it off, after a day they called and said it's a normal sound for this truck. I've given up on dealer service, my 2019 Colorado spent a ton of time at the dealer for 8 speed issues and 4x4 issues and the dealers were always trying to get out of doing anything or telling me nothing is wrong.

 

It has slowly gotten worse and I told them my new truck shouldn't sound like the old S10 I drove in school but they stuck to their answers. 

 

Ordered a mechanics stethoscope coming in the mail but I'm no mechanic, even a backyard one so not too hopeful. If I can't get a fix for it Im debating just getting exhaust work to make the truck louder and drown it out

 

Hope everyone keeps at it and gets some answers!

 

Edited November 3, 2024 by Big Timber

[Tracker48]

This could be the noise mentioned in this thread.
Well at least this is what I'm going with.
https://www.gm-trucks.com/gm-62l-66l-v8-engine-noises-normal-explained/

[mrjulian416]

14 hours ago, Tracker48 said:

This could be the noise mentioned in this thread.
Well at least this is what I'm going with.
https://www.gm-trucks.com/gm-62l-66l-v8-engine-noises-normal-explained/

Now that I've read that article, I can almost convince myself that the sound I'm hearing is kinda like a spark knock you'd hear under load/acceleration... kinda.

 

Almost.

[2500TB]

My brand new 25 2500 6.6 L8T does the same thing on startup. I haven't tried taking it to the dealer yet. 

[2500TB]

On 4/2/2025 at 10:06 PM, Tracker48 said:

This could be the noise mentioned in this thread.
Well at least this is what I'm going with.
https://www.gm-trucks.com/gm-62l-66l-v8-engine-noises-normal-explained/

I bet that's it!

[MudMonkey]

I use midgrade gas.  I wonder if premium would make the noise go away.  I will try this out and see what happens.